#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define itn int
#define rep2(i,a,n) for(int i = (a);i < (n);i++)
#define rep(i,n) rep2(i,0,n)
using P = pair<int,int>;

int main(void){
    string a,b;
    cin >> a >> b;
    sort(a.begin(),a.end());
    sort(b.begin(),b.end());
    
    if(a == b)cout << "YES" << endl;
    else cout << "NO" << endl;
}